Author
Masataka Kishi
Bio: Masataka Kishi is an academic researcher from Kyoto Prefectural University of Medicine. The author has contributed to research in topics: Acetylcholine & Cysteine sulfinic acid. The author has an hindex of 7, co-authored 19 publications receiving 223 citations.
Papers
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TL;DR: Results suggest that GCG may be a novel antiallergic constituent among tea catechins, and also the most potent.
Abstract: The antiallergic constituents of oolong tea stem were examined. The stem extracts inhibited the 48 h homologous passive cutaneous anaphylaxis (PCA) reactions or rats in a dose-dependent manner and showed the same extent of inhibitory activity as ketotifen. All antiallergic constituents from the stem were concentrated into chloroform and ethyl acetate fractions, when extracted by various solvents. These fractions were treated with polyvinylpolypyrrolidone (PVPP), which resulted in the elimination of antiallergic activity in the ethyl acetate fraction, suggesting that one of the antiallergic constituents may be tea catechins. Then, six kinds of catechins, (-)-epigallocatechin gallate (EGCG), (-)-epigallocatechin (EGC), (-)-epicatechin gallate (ECG), -epicatechin (EC), (+)-catechin (C) and (-)-gallocatechin gallate (GCG), were isolated from the ethyl acetate fraction, and the inhibitory activity of these catechins on histamine release from rat peritoneal mast cells passively sensitized with anti-egg albumin (EA) IgE antibody was investigated. Among these catechins, significant inhibitory activity was observed in all the catechins except for EC. In addition, the inhibitory activity of GCG was greater than that of EGCG, which is well known to be an antiallergic constituent in tea. These results suggest that GCG may be a novel antiallergic constituent among tea catechins, and also the most potent.
82 citations
TL;DR: The results indicate that cerebral cortical neurons in primary culture possess GABA biosynthesizing and degrading systems including a high-affinity uptake mechanism for GABA and that these cells possess synaptic contacts as well as GABAA receptors coupled with benzodiazepine receptor from a relatively early stage of cellular development.
52 citations
TL;DR: The results clearly indicate that taurine uptake was mediated by the sodium- and energy-dependent transport system with high affinity in 14-day-old neurons as well as neurons cultured for 3 days and that both the Km and Vmax values of this transport system increase during neuronal development in vitro.
23 citations
TL;DR: The results suggest that the up-regulation in muscarinic cholinergic receptors induced by long-term exposure to atropine may involve not only the increase in number ofMuscarinic receptors but also the decreased responsiveness in Muscarinic receptor-coupled second messenger systems.
13 citations
TL;DR: The results indicate that primary cultured neurons possess a cyclic AMP generating system coupled with β‐adrenergic and muscarinic receptors, which is regulated via stimulatory and inhibitory GTP‐binding proteins, respectively.
11 citations
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TL;DR: The current available evidence regarding astaxanthin chemistry and its potential beneficial effects in humans is reviewed and an unusual antioxidant activity which has caused a surge in the nutraceutical market for the encapsulated product is reviewed.
Abstract: Astaxanthin is a carotenoid widely used in salmonid and crustacean aquaculture to provide the pink color characteristic of that species. This application has been well documented for over two decades and is currently the major market driver for the pigment. Additionally, astaxanthin also plays a key role as an intermediary in reproductive processes. Synthetic astaxanthin dominates the world market but recent interest in natural sources of the pigment has increased substantially. Common sources of natural astaxanthin are the green algae Haematococcus pluvialis, the red yeast, Phaffia rhodozyma, as well as crustacean byproducts. Astaxanthin possesses an unusual antioxidant activity which has caused a surge in the nutraceutical market for the encapsulated product. Also, health benefits such as cardiovascular disease prevention, immune system boosting, bioactivity against Helycobacter pylori, and cataract prevention, have been associated with astaxanthin consumption. Research on the health benefits of astaxanthin is very recent and has mostly been performed in vitro or at the pre-clinical level with humans. This paper reviews the current available evidence regarding astaxanthin chemistry and its potential beneficial effects in humans.
953 citations
TL;DR: In this paper, the authors propose a method to identify the root cause of a problem.Abbreviations: [2]... ].., [3]
539 citations
Emory University1, Johns Hopkins University2, Temple University3, University of Utah4, Swiss Institute of Allergy and Asthma Research5, University of Chicago6, Ghent University7, Humanitas University8, Eskişehir Osmangazi University9, Imperial College London10, University of California, San Diego11, University of North Carolina at Chapel Hill12, Rutgers University13, University of Amsterdam14, University of Missouri15, University of Texas Southwestern Medical Center16, Aarhus University17, Hannover Medical School18, Case Western Reserve University19, Stanford University20, Harvard University21, University of Turku22, University of Colorado Boulder23, University of Texas at Austin24, San Antonio Military Medical Center25, University of Pittsburgh26, University of Texas Health Science Center at Houston27, Ochsner Health System28, Uniformed Services University of the Health Sciences29, Karolinska Institutet30, Wake Forest University31, University of Pavia32, University of Barcelona33, University of Colorado Denver34, Loyola University Chicago35, Nippon Medical School36, Heidelberg University37, Boston University38, Cornell University39, University of Calgary40, Medical University of South Carolina41, Brown University42, George Washington University43, University of Edinburgh44, Oregon Health & Science University45, Mahidol University46, National University of Singapore47, University of Michigan48
TL;DR: To evaluate the existing AR literature, international multidisciplinary experts with an interest in AR have produced the International Consensus statement on Allergy and Rhinology: Allergic Rhinitis (ICAR:AR).
Abstract: BACKGROUND:
Critical examination of the quality and validity of available allergic rhinitis (AR) literature is necessary to improve understanding and to appropriately translate this knowledge to clinical care of the AR patient. To evaluate the existing AR literature, international multidisciplinary experts with an interest in AR have produced the International Consensus statement on Allergy and Rhinology: Allergic Rhinitis (ICAR:AR).
METHODS:
Using previously described methodology, specific topics were developed relating to AR. Each topic was assigned a literature review, evidence-based review (EBR), or evidence-based review with recommendations (EBRR) format as dictated by available evidence and purpose within the ICAR:AR document. Following iterative reviews of each topic, the ICAR:AR document was synthesized and reviewed by all authors for consensus.
RESULTS:
The ICAR:AR document addresses over 100 individual topics related to AR, including diagnosis, pathophysiology, epidemiology, disease burden, risk factors for the development of AR, allergy testing modalities, treatment, and other conditions/comorbidities associated with AR.
CONCLUSION:
This critical review of the AR literature has identified several strengths; providers can be confident that treatment decisions are supported by rigorous studies. However, there are also substantial gaps in the AR literature. These knowledge gaps should be viewed as opportunities for improvement, as often the things that we teach and the medicine that we practice are not based on the best quality evidence. This document aims to highlight the strengths and weaknesses of the AR literature to identify areas for future AR research and improved understanding.
401 citations
TL;DR: It is found that taurine is stored in immature cortical neurons and that manipulations known to elevate extracellular taurin cause GlyR activation, indicating that nonsynaptically released taurines activates GlyRs during neocortical development.
319 citations
TL;DR: Taurine appears to have multiple functions and plays an important role in many physiological processes, such as osmoregulation, immunomodulation and bile salt formation.
Abstract: PURPOSE OF REVIEW: Taurine, a free amino acid, is found in millimolar concentrations in most mammalian tissues. Mammals are able to synthesize taurine endogenously, but some species such as humans are more dependent on dietary sources of taurine. A growing body of evidence suggests that taurine plays a preponderant role in many physiological processes, which will be summarized in this review. RECENT FINDINGS: Evidence for the requirement of taurine in the human diet has been obtained in many studies involving animal models and a few clinical trials. Recent and past studies suggested that taurine might be a pertinent candidate for use as a nutritional supplement to protect against oxidative stress, neurodegenerative diseases or atherosclerosis. Taurine has demonstrated promising actions in vitro, and as a result clinical trials have begun to investigate its effects on various diseases. SUMMARY: Taurine appears to have multiple functions and plays an important role in many physiological processes, such as osmoregulation, immunomodulation and bile salt formation. Taurine analogues/derivatives have recently been reported to have a marked activity on various disorders. Taken together, these observations actualize the old story of taurine.
290 citations